So likewise you, unless you utter by the tongue words easy to understand, how will it be known what is spoken? For you will be speaking into the air.
1 Corinthians 14:9
Surrounding context
14:8 For if the trumpet makes an uncertain sound, who will prepare for battle?
14:9 So likewise you, unless you utter by the tongue words easy to understand, how will it be known what is spoken? For you will be speaking into the air.
14:10 There are, it may be, so many kinds of languages in the world, and none of them is without significance.